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| The determination of trace thallium in soil by Graphite Furnace Atomic Absorption Spectrometry (GFAAS) using ascorbic acid as a sensitizer |
Sheng-Bing JIAO1, Meng-Ying HU2,3, Xue-Miao DU2,3, Jin-Li XU2,3( ) |
1. Regional Geology Survey Institute of Hebei Province, Langf ang 065000, China
2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
3. UNESCO International Centre on Global-Scale Geochemistry, Langfang 065000, China |
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Abstract A method for the pretreatment and determination of trace thallium in soil by Graphite Furnace Atomic Absorption Spectrometry (GFAAS) with mixed acids sample digestion system was established. In this study, the authors investigated the optimum instrumental conditions for the determination and optimized the concentration and volume of the matrix modifier, adsorption-desorption system, adsorption acidity and the oscillation time. The detection limit was 0.015×10 -6, and the relative standard deviation was from 5.49% to 13.42%. The method was verified by National Standard Reference Material and the results were accurate and reliable.
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Received: 23 November 2018
Published: 31 May 2019
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Corresponding Authors:
Jin-Li XU
E-mail: 80368070@qq.com
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Effect of lamp current on absorbance and negative high pressure
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Effect of passband width on absorbance and negative high pressure
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Results of ashing temperature and atomization temperature of Tl
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Effect of sample decomposition method on Tl measurement results
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Effect of adsorption system on sample recovery
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| 样品号 | 空白样 | 标准
偏差 | 检出限 | | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | | 测定值/10-6 | 0.005 | 0.004 | 0.014 | 0.005 | 0.011 | 0.018 | 0.005 | 0.004 | 0.005 | 0.004 | 0.008 | 0.005 | 0.005 | 0.015 |
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Detection limit of the method
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| 样品号 | 标准物质(GBW) | | 07103 | 07104 | 07402 | 07446 | 07454 | 07309 | 07310 | 07336 | | 1 | 1.75 | 0.17 | 0.51 | 0.56 | 0.50 | 0.46 | 0.19 | 1.16 | | 2 | 1.62 | 0.18 | 0.56 | 0.49 | 0.56 | 0.47 | 0.19 | 0.98 | | 3 | 1.82 | 0.17 | 0.54 | 0.60 | 0.53 | 0.45 | 0.22 | 0.95 | | 4 | 1.54 | 0.16 | 0.54 | 0.50 | 0.63 | 0.41 | 0.18 | 1.06 | | 5 | 1.81 | 0.19 | 0.62 | 0.57 | 0.50 | 0.51 | 0.22 | 0.96 | | 6 | 1.56 | 0.13 | 0.55 | 0.47 | 0.53 | 0.53 | 0.21 | 1.10 | | 7 | 1.71 | 0.22 | 0.58 | 0.55 | 0.61 | 0.47 | 0.19 | 1.13 | | 8 | 1.83 | 0.16 | 0.54 | 0.53 | 0.65 | 0.41 | 0.20 | 1.07 | | 9 | 1.69 | 0.19 | 0.56 | 0.54 | 0.54 | 0.55 | 0.23 | 0.98 | | 10 | 1.95 | 0.14 | 0.60 | 0.49 | 0.59 | 0.52 | 0.19 | 1.00 | | 11 | 1.81 | 0.18 | 0.55 | 0.60 | 0.63 | 0.42 | 0.21 | 1.08 | | 12 | 1.76 | 0.18 | 0.53 | 0.55 | 0.66 | 0.55 | 0.18 | 1.07 | | 平均值 | 1.74 | 0.17 | 0.56 | 0.54 | 0.58 | 0.48 | 0.20 | 1.04 | | 标准偏差 | 0.12 | 0.02 | 0.03 | 0.04 | 0.06 | 0.05 | 0.02 | 0.07 | | RSD/% | 6.90 | 13.42 | 5.49 | 7.98 | 9.75 | 10.98 | 8.35 | 6.76 | | 标准值 | 1.93 | 0.16 | 0.62 | 0.51 | 0.59 | 0.49 | 0.20 | 1.05 | | ΔlgC | -0.05 | 0.03 | -0.05 | 0.02 | -0.01 | -0.01 | 0.00 | 0.00 |
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The precision and accuracy of Tl content of standard substance sample solutions
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